It would be a late manufactured short action tang safety 'Flatboat' M77V. Most likely a Douglas barrel, but might be late enough (1973) to have a Wilson barrel.
There is no way to physically prove who made the barrel. There will be no markings on the barrel to indicate the company that manufactured it.
However, whether it is a Douglas barrel or a Wilson barrel it should shoot very well. In my experience, the QC problems with Wilson barrels started later than 1973. But, even most of the Wilson barrels are fine. My flatbolt .250Savage is also a late manufactured rifle and it shoots its favorite loads well under MOA.
